I had no idea your simulator existed. No XCMDs, correct; everything is pure HyperTalk. I just ran a few training steps and they complete in a second or two. Thank you for importing it!
More of a copy-paste process. The scripts are written as .txt files in Nova on my Mac Studio, then pasted one at a time into HyperCard's script editor on the classic Mac. The files are kept separate because SimpleText has a 32 KB text limit.
Does HyperCard implement its on text handling for the HyperTalk editor that doesn't rely on the TextEdit toolbox service (which IIRC is the source of SimpleText's 32 kB limit)?
Fields appeared to use TE and I suppose the script editor was pretty much limited to 32 kB of text for that reason, although you could have any size of text in a variable.